In-depth explanation of file_get_contents and curl functions_PHP tutorial

Some hosting service providers turn off the allow_url_fopen option of PHP, so they cannot directly use file_get_contents to obtain the content of the remote web page. That is, you can use another function curl.
The following are different ways of writing the same function of the file_get_contents and curl functions
Example of using the file_get_contents function:

Copy Code The code is as follows:

< ?php
$file_contents = file_get_contents('http://www.jb51.net');
echo $file_contents ;
?>

Example of using curl function:

Copy code The code is as follows:

< ?php
$ch = curl_init();
$timeout = 5;
curl_setopt ($ch, CURLOPT_URL, 'http://www .jb51.net');
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$file_contents = curl_exec($ch);
curl_close ($ch);
echo $file_contents;
?>

Use the function_exists function to determine whether php supports a function. You can easily write the following function

Copy code The code is as follows:

< ?php
function vita_get_url_content($url) {
if(function_exists('file_get_contents') ) {
$file_contents = file_get_contents($url);
} else {
$ch = curl_init();
$timeout = 5;
curl_setopt ($ch, CURLOPT_URL, $url );
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$file_contents = curl_exec($ch);
curl_close($ch);
}
return $file_contents;
}
?>

In fact, the above function is still open to discussion. If your hosting service provider uses both file_get_contents and curl If it is turned off, an error will occur in the above function.

http://www.bkjia.com/PHPjc/327909.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/327909.htmlTechArticleSome hosting service providers have turned off the allow_url_fopen option of PHP, so they cannot directly use file_get_contents to obtain remote web pages. content. That is, you can use another function...